Father who stabbed son to avoid missing AFL grand final guilty of murder

A Perth father who stabbed his son to death and left his children to bury the body while he watched the AFL Grand Final has been found guilty of murder.

Ernest Fisher, 67, claimed he was acting in self-defence because his son Matthew Fisher-Turner, 23, was abusive and he had no option but to kill him.

He repeatedly stabbed Mr Fisher-Turner with two kitchen knives inside their Parmelia home on October 1, 2016.

Ernest Fisher has been found guilty of killing his son. Picture: 9NEWS (Supplied)Matthew Fisher-Turner was stabbed to death during an argument with his father. Picture: 9NEWS ()

The WA Supreme Court heard the final straw in their fractious relationship was when Mr Fisher-Turner insisted on borrowing his father's car, which triggered an argument because Fisher wanted to drive to a friend's house to watch the match.

Fisher partially dug a hole in the backyard then left to watch the grand final, which he told detectives was his "priority".

The victim's brother Joshua Fisher-Turner and sister Hannah Fisher-Turner were also found guilty of being accessories to murder after trying to cover up the crime.

Joshua admitted burying Mr Fisher-Turner while Hannah confessed to helping him carry the body to the backyard on a ladder, and both said they cleaned up other evidence.